Flaming-arc lamp.



T. SPENCER.

FLAMING ARC LAMP.

APPLICATION FILED SEPT. 20. m3.

1,289,567. 7 Patented Dec. 31, 1918.

4 SHEETS-SHEET I INVENTOR IH' 'UMAE EPENBER A A TTORNE) WITNESSES WITNESSES:

T. SPENCER.

FLAMING ARC LAMP.

APPLICATION FILED SEPT. 20. 1913.

Patented Dec. 31, 1918.

4 SHEETS-SHEET 3.

IIVl/EN TOR J6 2, MM

,4 TQRIVEY I'HUMAE 5 PENCER T. SPENCER.

' FLAMING ARC LAMP.

APPLICATION FILED SEPT. 20. 1913.

1 ,289,567 Patented Dec. 31, 1918.

4 SHEETS-SHEET 4.

WITNESSES: [MENTOR EQ firms EPENUER' A, DRIVE) To all whom it may concern:

UNITED STATES PATENT OFFICE.

THOMAS SPENCER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENT-S, TO NATIONAL CARBON COMPANY, INC., 0F CLEVELAND, OHIO.

- A. CORPORATION on NEW YORK.

FLAMING-ARG LAMP.

Specification of Letters Patent.

Patented Dec. 31, 1918.

Continuation of application Serial No. 742,550, filed January 17, 1913. This application filed September 20,

1913 Serial No. 790,847. 7

Be it known that I, THOMAS SPENCER, a citizen ofthe United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement" in Flaming-Arc Lamps, of which the following isa full, clear, and exact description.

This case is a continuation of my application filed January 17, 1913, Serial No. 742,550, with new features added.

My invention may be employed with particular advantage in lamps of the flaming arc type. Such lamps rapidly depreciate in luminosity during operation because the products of combustion condense, as a semiopaque film,upon the inner surface of the globe forming the immediate arc inclosure, and restrict the transmission of light therethrough. .I have discovered that the deposit upon the inner globe is dependent upon the temperature of the latter, and that if it is maintained at a temperature sufiiciently high the products of combustion within the globe will not condense'upon it and the globe remains transparent. Therefore, the principal object of my present invention is to provide an inclosed arc lamp with means which during the operation of the lamp maintain the inner globe at a temperature suificiently high to minimize and substantially prevent the obscuration of the inner globe by the depositof the productsof internal combustion thereon.

As hereinafter described, my invention includes an inner globe which is the immediate inclosure of the are; an outer globe surrounding said inner globe in closely spaced relation therewith so constructed and arranged as to holda substantially confined layer of hot air around said inner globe exterior to the latter. It also includes means for sealing the arc from external currents of air and means'for balancing the magnetic eii'ect'on the arc. Moreover, my invention includes means whereby all of the members of the lamp, which require cleaning, including said two globes, are held securely in cooperative relation but may be readily separated and reassembled with the minimum amount of manipulation.

My invention includes the 'various novel features of construction and arrangement hereinafter more definitely specified;

In the drawings, Figure 1 is an elevation of a lamp conveniently embodying my inventlon with the regulating mechanism ex posed. 1

Fig. 2 is a vertical sectional view of the lower portion of said lamp, taken on the line AA in Fig. 1.

Fig. 3 is a sectional view similar to Fig. 2 but showing the separable members disassembled. a

Fig. 4 is a plan view of the canopy frame.

Fig. 5 is a front View of the baffle section of the condensing chamber.

Fig. 6 is a plan view of the baffle section shown in Fig. 5. I

In the drawings, 1 is the top cap of the lamp frame having the supporting eye 2, terminals 3 and 4 and switch lever 5.

The frame is provided with a casing 7 which is removed in Fig. 1 to show the lamp governing mechanism designated as a whole by reference character 6. This mechanism will not be described in detail as it is old and well known in the art, and does not form part of my present invention. At the bottom of'the casing 7 is fitted a base plate 9 having an upwardly extending flange 10. for engagement with the casings. The base plate 9' is provided with the central bushing 12 through which the upper car bon 14 extends and supports the tubes 15 through which extend the slide rods 16 of the holder 17 of the lower carbon 18. The hollow tubes 15 are slotted on their outer side (Fig. 1) throughwhich extend connecting arms 16. An equalizing bar 17 connects together the two arms. A clamp 18 electrically connects the flexible terminal 19 to the equalizing bar. This clamp may be readily adjusted-along the bar to adjust the currents passing through the two rods 16 to the'lower carbon. In this way, the magnetic effect on the arc may be balanced. This is an'important feature as the'resistance of the slide rods may vary somewhat in practice, and furthermore, the distance betweeneach slide rod and the carbon may not be the same. When the lamp is assembled, the terminal clamp may be aflixed in sucha position on the equalizing rod that the arc is blown neither one way nor the other.

The downwardly extending cylindrical portion 20 of the base plate 9 is provided at the bottom with the two annular flanges 21 and 22, having an annular groove 24 between them for engagement with the flange 25 on the canopy frame 26 which supports the canopy 28.

The flange or tongue 25 of the canopy frame 26 as shown in Figs. 2 and 4 has a groove 23 therein which in reality divides it into two annular flanges 23 and 23. The outer face of the flange 23 has a series of shallow grooves 27 so that the groove 23 communicates with the outside to a limited extent. The inner face of the flange 23" has a similar number of shallow grooves 27" so that the annular groove 23 communicates with the chamber 37. It is preferable to stagger the grooves 27 in relation to the grooves 27 so as to make the course of the air circuitous.

The canopy frame 26- has the vertically extending annular baffle 30 in concentric relation with the carbons 14 and 18, surrounded by the annular seat 31 on which detachably rests the baffle ring 34 having the curved conical baffle flange 35 depending, Within said flange 30 of the frame 26, in close relation with the carbon holders.-

As shown in Figs. 5 and 6 the baffle ring 34 is removably fastened to the canopy frame by a type of bayonet joint formed by projecting screws 29 in the canopy frame and cooperating notches 29 in the base 34 of the baffie ring. A plurality of spaced openings 31 are formed in the said baflie ring by cutting away parts of the baffle 34 and its base 34, so that the chamber 37 communicates with the chamber 38.

Referring to Fig. 2, it may be observed that the construction and arrangement of the baflie ring 34 is such as to form two annular dust chambers 37 and 38. The chamber 37 is formed between the ring 34, the base plate 9'and its depending portion 20, and the chamber 38 is formed between the ring 34, the base plate 9 and the baffle flange 30 of the canopy frame 26.

The dust carrying gases travel through the sinuous path traced on the drawing by the arrows. As the gases pass over the baflie 34, they become cooled and in the descent into the arc chamber are forced to rise over the flange 30. This downward and upward movement, I have found to be very effective in causing the dust particles to settle in the dust chambers on each side of the baffle 34 instead of collecting on the sides of the globe. If any gas is forced out of the lamp by the pressure, it will have to pass up the slots or channels 27 to'pass over the flange 23 and the heavy dust particles will be left behind in the dust chambers as previously described.

The canopy frame is detachably connected with the base plate by the clamping means including the hook lugs 40 on the base plate, spring bails 4l pivotally connected with the frame in the bearing lugs 42 of the latter, and the eccentrics 43 which are carried by the bails and provided with the handles 45 by which they may be turned when in engagement with the hook lugs 40 to variably engage the latter; it being understood that the eccentrics are turned to afford the greatestspacebetween them and the bearing lugs 42 in order to slip them over the hook lugs 40 and are then turned on the latter to the position shown in Fig.

2 so as to clamp the frame to the base plate under the spring pressure of the bails 41.

The canopy frame 26 has two annular globe seats 47 and 48 to which the inner globe 49 and outer globe 50 are respectively fitted in substantially air tight relation, the upper edges of the globes being ground flat for that purpose.

The outer globe 50 has the spring retaining bead and upwardly extending indentation 56 at the bottom thereof. The spring bail 58 is pivotally connected with the eyes 59 on the canopy frame 26, beneath the latter, and has the central roller member 61 arranged to detachably engage the indentation 56 thus maintaining the latter tightly in contact with the seat 48 on the canopy frame 26 under the spring pressure of the bail 58.

The outer globe 50 has the spiral spring 63 which snaps into engagement with the bead 55, so that it will not fall out when the globe is inverted, and has the member 64 arranged to detachably engage the indentation 53 in the inner globe 49, thus maintaining it tightly in contact with its seat 47 on the canopy frame 26. a

It will be observed that by the construction and arrangement of the lamp members above described a substantially confined heated atmosphere is maintained within said inner globe 49, and in the chamber 65 between the closely spaced globes 49 and 50.

The inner globe communicates with the atmosphere through the openings 31, grooves 27 groove 23 and grooves 27. The grooves 27 are made large enough to permit only sufficient air to enter the inner globe for quiet burning of the arc. By the arrangement just described, air is admitted to the inner globe to a limited amount, but puffs of wind are not felt within as'the air rushing in through grooves 27 on one side of the lamp, forces the air in the groove 23 out throughthe openings 27 on the other side. This is an important feature of my invention as the arc is little affected by high winds although allowed suflicient quantity of air for operating purposes.

It may be observed that by merely upturning the handles 45 from the position shown in Fig. 2 the clamps may be readily disengaged from the hook members 40 thus releasing and permitting the removal of the canopy frame 26 as shown in Fig. 3. By merely turning the bail 58 aside so as to disengage the roller 61 from the outer globe 50, both globes may be removed and may be separated for cleaning as indicated in Fig. 3. That is to say, all of the parts in which dust from the products of combustion may accumulate are readily removable and separable for cleaning, and may be as readily restored to their assembled position shown in Fig. 2.

It is to be understood that when the lamp is operated with the parts in the assembled position shown in Fig. 2 the inner globe 4:9 is maintained at a temperature so high that the products of combustion within instead of condensing upon and obscuring the inner surface condense upon the battle plate and in the dust chambers 37 and 38, leaving the inner globe transparent.

I do not limit myself to the precise details of construction and arrangement herein set forth as it is obvious that. various modificationsmay be made therein without departing from the essential features of my invention as defined in the appended claims.

I claim 1. In an arc lamp, electrodes for producing the are, a member surrounding one 01"- the electrodes having flanges forming a channel, and a second member having flanges adapted to fit against said first mentioned flanges, one of said flanges having ducts extending from the channel toward the electrodes, and another of said flanges having ducts extending from the channel away from the electrodes.

2. In an arc lamp, electrodes for producing an are, a member having a plurality of annular flanges, a second member having a plurality of annular flanges, two of which are adapted to fit over two of the flanges of the first member to produce an annular channel, one of the flanges on each side of the channel having a plurality of ducts leading thereto.

3. In an arc lamp, electrodes producing an are, a member surrounding one electrode having an inner, an outer, and an inter-- mediate flange, a second member having an inner, an outer and an intermediate flange, the outer and intermediate flanges of one member closely fitting over the outer and intermediate flanges of the other member, to produce a channel, a baflie member secured to the first member between the inner and the intermediate flanges, having a plurality of openings to connect together the channels formed between it and each of the flanges of the first member.

4. In an arc lamp, electrodes for producing an are, an annular condensing chamber above the arc consisting of separable top and bottom parts, one of said parts having an annular groove and the other an annular tongue adapted to fit into said groove, one wall of each pair of adjacent walls of said tongue and groove having grooves extending across it.

5. In an arc lamp, electrodes for producing an arc, an annular condensing chamber above the arc consisting of separable top and bottom parts, one of said parts having an annular groove with divergent walls and the other an annular tongue with convergent Walls adapted to fit into said groove, one wall of each pair of adjacent walls of said tongue and groove having grooves extending across it.

6. In an arc lamp, a condensing chamber, electrodes for producing an are, an annular chamber above the arc consisting of sep arable top and bottom parts, one of said parts having an annular groove with divergent walls and the other an annular tongue with convergent walls adapted to fit into said groove, said tongue being provided with an annular groove, and one wall of each pair of adjacent walls of said tongue and groove having channels across it where by air may enter through the outside channels into the groove in said tongue and through the inside channels into the condensing chamber.

7. In an arc lamp, a globe to inclose the are, an annular condensing chamber above the globe consisting of separable top and bottom parts, said bottom part having an upwardly extending flange, a baflie ring extending upwardly from the bottom part and thence downwardly over said flange, said baflle ring being provided with a plurality of transverse openings where it is secured to the bottom member, and means for detachably securing the ring to the bottom part.

In testimony whereof, I hereunto affix my signature.

THOMAS SPENCER.

Witnesses CHAS. IV. GULDEN, REED H. :KLAUDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

